Potential buyers must be aged 18 or over, reside in the US and fill in an online form to get their hands on a pair of the smartglasses, which will set them back $1,500 plus taxes. Devices are limited to an unspecified number and will be issued on a first-come, first-served basis.

"Next Tuesday, April 15th at 6am PDT, we're opening up some spots in the Glass Explorer Program," Google revealed on its Google+ page.

"We're excited to meet our new Explorers, and we can't wait to hear your thoughts about Glass."

The Android owner also apologised to countries outside the US, which have so far been locked out of Google Glass access.

"We're just not ready yet to bring Glass to other countries," it explained.

It's thought that privacy and legal concerns in individual countries may be the reason behind the lack of expansion, as well as regional differences, although BBC News believes developers in Britain may be in line for Google Glass as soon as May or June.